Leaks of material not yet available to the public are always a curiosity online. Anything pre-release can generate excitement, particularly so if the item offers a unique window into the usually hidden production process.

Back in 2009 the movie Wolverine appeared on the Internet in advance of its official release. The copy was unfinished and provided a version of the film to downloaders that would have otherwise remained hidden forever. Now that same dubious status has fallen to Doctor Who.

After appearing online over the weekend, what claims to be episode one of the new series of the hit show was uploaded to The Pirate Bay today. The 1.49Gb file is marked as a “pre air screeneer” with a claimed running time of one hour and 16 mins.

While leaks of TV shows are much more rare than movie leaks, this copy is particularly unusual. Clearly unfinished, the video is both heavily watermarked and monochrome.

As can be seen from the image above, the copy carries the text “Prepared for Marcelo Camargo at Drei Marc.”

Marcelo Camargo is the owner of Marc Drei Productions, a Brazil-based production company known for its subtitling work. There is no suggestion that Camargo or his company is responsible for the leak.

This is the second serious breach in a matter of days to hit Doctor Who and the BBC. Just last week scripts from the new series leaked online after inadvertently being made available to the public by a BBC Worldwide office in the U.S. It seems likely that this video comes from the same source.

Last month the file-sharing leak phenomenon hit the upcoming season of Doctor Who.

Following a catastrophic error at a BBC office in Miami, not only were the new seasons’ scripts made available to the public, but several episodes too.

It’s unclear how many people downloaded the videos directly from the server, but it soon became clear that episode one had leaked when it appeared on The Pirate Bay and other file-sharing sites. It was an unfinished ‘workprint’ release, destined for Marcelo Camargo of Marc Drei Productions, a Brazil-based production company known for its subtitling work.

Soon after rumors turned to a potential leak of episode two. A torrent was certainly uploaded to The Pirate Bay, but whoever seeded that file in the first instance quickly backed away, leaving the torrent at just a few percent complete. This led many to presume that the release was a fake, but that wasn’t to be the case. A full copy was definitely waiting somewhere.

On Sunday at least one torrent sprang back to life temporarily, surprising people who had patiently left it in their client to complete. While it reportedly went quiet again, another torrent appeared claiming to be of the same material. As both torrents completed confirmation arrived that the leak, which had lay dormant for several weeks, was indeed real.

Weighing in just short of 987MB, the episode is called ‘Into the Dalek’ and once again it is another unfinished ‘workprint’ copy, as the screenshot below shows.

In addition to being covered in text watermarks, the episode is presented in black and white, with many special effects absent. Its naming convention matches the screenshot above, suggesting that this leak was also obtained from the BBC website.

While the BBC will be disappointed not to have contained this second episode, there are currently no signs that any of the remaining episodes have leaked to file-sharing networks.

The leak is only the latest in a long line of workprint copies of movies and TV shows to be made available online. It certainly won’t be the last.